D20:Flail, Heavy Weapon

With a flail, you get a +2 bonus on opposed attack rolls made to disarm an enemy (including the roll to avoid being disarmed if such an attempt fails).
You can also use this weapon to make trip attacks. If you are tripped during your own trip attempt, you can drop the flail to avoid being tripped.

Heavy Flail Material Enhancements

Material	Average	Masterwork1	Hardness	hp	Special
Steel	15 gp	315 gp	5	10	?
Adamantine	?	3,015 gp	5	13	Bypass hardness less than 20
Crystal, Deep	?	1,015 gp	10	30	Psionic
Crystal, Mundane	?	{{{mccost|315 gp}}}	8	25	No rusting, not metal
Darkwood	?	n/a	n/a	n/a	?
Iron, Cold	30 gp	330 gp	5	10	Magical enchantments cost an additional 2,000 gp.
Mithral	?	5,015 gp	5	10	1/2 weight
Silver, Alchemical	195 gp	495 gp	5	10	−1 damage
Masterwork weapons have a +1 enhancement bonus on attack rolls. The SRD gives neither this value nor a means to accurately determine it.

Magical/Psionic Weapon Enhancements

Bonus Value	Additional Cost1	Hardness Increase2	Additional hp2
+1	+Template:formatnum: -- template expr: 40 50 gp	+2	+10
+2	+Template:formatnum: -- template expr: 160 50 gp	+4	+20
+3	+Template:formatnum: -- template expr: 360 50 gp	+6	+30
+4	+Template:formatnum: -- template expr: 640 50 gp	+8	+40
+5	+Template:formatnum: -- template expr: 1000 50 gp	+10	+50
+6	+Template:formatnum: -- template expr: 1440 50 gp3	+12	+60
+7	+Template:formatnum: -- template expr: 1960 50 gp3	+14	+70
+8	+Template:formatnum: -- template expr: 2560 50 gp3	+16	+80
+9	+Template:formatnum: -- template expr: 3240 50 gp3	+18	+90
+10	+Template:formatnum: -- template expr: 4000 50 gp3	+20	+100
+11 or more	+ bonus × bonus × Template:formatnum: -- template expr: 400 50 gp	+ enhancement bonus × 2	+ enhancement bonus × 10
Increase total cost for magical enhancement by 2,000 gp for cold iron weapons. Unlike the additional cost, the increase the weapon's hardness and hit points are only gained from its enhancement bonus, not its special abilities. If the weapon has a magical bonus greater than +5 or a special ability worth more than +5, the weapon is epic. Multiply magic cost by 10.

• Weapon Qualities (SRD Rules)
  
• Magic Items: Weapons (SRD Rules)
  
• Wikipedia: Flail
  

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System Reference Document -> Equipment (SRD) -> Weapon Descriptions (SRD Equipment)